TUSB8040

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SLLSE42F

– SEPTEMBER 2010 – REVISED OCTOBER 2011

3.3.4

Product ID LSB Register

Table 3-8. Register Offset 3h

BIT NO.

7

6

5

4

3

2

1

0

RESET STATE

0

0

0

0

0

1

0

0

Table 3-9. Bit Descriptions

– Product ID MSB Register

BIT

FIELD NAME

ACCESS

DESCRIPTION

Product ID LSB. Least significant byte of the product ID assigned by Texas Instruments; the

default value of this register is 40h representing the LSB of the product ID assigned by

Texas Instruments. The value of this register will be reported as configured for the

7:0

productIdLsb

RW

SuperSpeed Device descriptor. The USB 2.0 Device descriptor will report the value in this

register with bit [1] toggled. This ensures that the USB drivers load properly for both hubs.

The value may be over-written to indicate a customer product ID.

3.3.5

Product ID MSB Register

Table 3-10. Register Offset 4h

BIT NO.

7

6

5

4

3

2

1

0

RESET STATE

1

0

0

0

0

0

0

0

Table 3-11. Bit Descriptions

– Product ID MSB Register

BIT

FIELD NAME

ACCESS

DESCRIPTION

Product ID MSB. Most significant byte of the product ID assigned by Texas Instruments; the

7:0

productIdMsb

RW

default value of this register is 80h representing the MSB of the product ID assigned by

Texas Instruments. The value may be over-written to indicate a customer product ID.

3.3.6

Device Configuration Register

Table 3-12. Register Offset 5h

BIT NO.

7

6

5

4

3

2

1

0

RESET STATE

0

0

0

X

X

X

X

X

Table 3-13. Bit Descriptions

– Device Configuration Register

BIT

FIELD NAME

ACCESS

DESCRIPTION

Custom Strings enable.

Manufacturer String, Product String Length, Product String, and Language ID registers are

7

customStrings

RW

loaded from the contents of the EEPROM.

When the value of this bit is 1 and the TUSB8040 is in SMBUS mode, the Manufacturer

String Length, Manufacturer String, Product String Length, Product String, and Language

ID registers may written by an SMBus host.

Custom Serial Number Enable.

the contents of the EEPROM.

6

customSernum

RW

When the TUSB8040 is in SMBUS mode, the Serial Number registers may written by an

SMBus host.

This bit is always 1.

Copyright

© 2010–2011, Texas Instruments Incorporated

FUNCTIONAL DESCRIPTION

19

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